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Table of contents

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Back to the main page 1. Compute Background Evolution 2. Compute Recombination History 3. Compute Perturbations 4. Compute Powerspectrum

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Compute Recombination History

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Here you can select the cosmologically parameters and numerically compute the recombination history in $\Lambda$CDM and make some plots. NB: For Helium we use the Saha approximation and for Hydrogen we use the Peebles equation. For reionization we use the $\tanh$ model that is standard in CAMB and CLASS. The results using the fiducial parameters below can also be found here.

Background parameters
Hubble parameter ($H_0\equiv 100 h{\rm km/s/ Mpc}$):
$h$:
Baryon density:
$\Omega_b$:
CDM density:
$\Omega_{\rm CDM}$:
Curvature density ($\Omega_k \equiv -k/H_0^2$):
$\Omega_k$:
Temperature of the CMB today ($\Omega_\gamma \propto T_{\rm CMB}^4 / h^2$):
$T_{\rm CMB}$ (K):
Effective number of neutrinos ($\Omega_\nu \equiv N_{\rm eff}\frac{7}{8}\left(\frac{4}{11}\right)^{4/3}\Omega_\gamma$):
$N_{\rm eff}$:
Dark energy equation of state (CPL parametrisation) $w = w_0 + w_a(1-a)$:
$w_0$:
$w_a$:
Recombination parameters
Primordial helium (mass) abundance:
$Y_p$:
Include Reionization:
Reionization (H and He) redshift:
$z_{\rm reion}$:
Reionization (H and He) redshift width:
$\Delta z_{\rm reion}$:
Include He+ Reionization:
He+ reionization redshift:
$z_{\rm HeReion}$:
He+ reionization redshift width:
$\Delta z_{\rm HeReion}$:
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